World clock



Feb. 16, 1937. H. SCHLACH T 7 WORLD CLOCK Filed Feb. 20, 1935 3Sheets-Sheet l I II II 4\ v 7 INVENTORZ I TORNEY Feb. 16, 1937. H HL CHT2,070,687

WORLD CL'OCK Filed Feb. 20, 1935 5 heets-Sheet 2 FIG 3.

INVENTOR DWW BY zu/ 2 z I,

TORNEY Feb. 16, 1937. 5 A 2,070,687

WORLD CLOCK Filed Feb. 20, 1935 3 Sheets-Sheet 3 FIG. 6'.

INVENTOR WWW/Wt BYW ORNEY Patented Feb. 16, 1937 REISSUED UNlTED STATESPATENT OFFICE 6 Claims.

My invention relates particularly to clocks to be used in connectionwith all-waveradio sets. with the advent of these sets there has risen ademand for a timepiece which would enable one to determine quickly thetime in the principal cities of the world. I am aware of the fact thatnumerous devices have been made for this purpose and those with which Iam familiar are subject to the objection that they are complicated andtoo crowded in their information to be easily read.

-My invention has for its object to provide a very simple device of thischaracter and which will enable the user to obtain at a glance therequired information.

My means f accomplishing the foregoing objects may be more readilyunderstood by having reference to the accompanying drawings which arehereunto annexed and are a part of this specification, in which Fig. lis a front elevation of my improved clock;

Fig. 2 is a side elevation of the same;

Fig. 3 is a front elevation of one of the details;

Fig. 4 is a rear view of the same together with the gear train connectedtherewith;

Fig. 5 is a side View of the same;

Fig. 6 is a vertical sectional view showing the interior construction;

Fig. 7 is a side elevation of a modified form of my invention.

Similar reference numerals refer to similar parts throughout the entiredescription.

As shown in the drawings, I employ a standard clock movement I. To thisI fit my improvement. The movement I is mounted in a case 2, providedwith the usual crystal 2. In this case I cut a slot 3 which extends fromone side of the base 4 around to the other side of the base. This slot 3may be closed with any desired kind of transparent material 5. I havefound celluloid serves the purpose very well. I provide a disc 6 havinga circumferential flange l which fits inside of the case 2 and isprovided with two sets of numerals 1 to 12 and 1 to 12 which may beprinted upon a strip of paper which can be pasted or otherwise securedto the periphery of the flange l. A stripe 8 is printed above one set ofnumerals and below the other to indicate a. m. and p. m. respectively.Upon the inside of the disc and adjacent a central opening provided forthe hands of the clock I mount a gear 9 which meshes with the gears II]which carry the hands H and I2, the ratio being such that the disc 6will be rotated once in 24 hours. I provide an annulus 14 which has thenumerals for the face of the clock which is mounted intermediate thecrystal 2' and the outer surface of the disc 6. I then scribe upon theexterior of the case 2 adjacent the slot 3 and on each side thereof aplurality of pairs of time zones arranged in a semi- 5 circle, each pairbearing in opposition the-names of various cities such as Kodiak,Moscow, Sitka, Baghdad, San Francisco, Nova Zembia, etc., theirpositions being determined by their longitude. Those above the stripe Sare located in one hemisphere of the earth, while those below are in theopposite one. As a result when one wishes, for example, to determine thetime at Singapore, when it is 9 oclock in New York city, by glancing atthe side of the clock for the city in question 15 and comparing it withthe numerals on the disc he will be at once furnished with the time atthat city. If the stripe 8 is above the numerals on the flange "i, itwill be the hour indicated in a. m., on the other hand if the stripe 8is below the numerals then it is the time indicated in p. m. It shouldbe here noted that the places in the subdivisions immediately adjacentthe stripe have the time indication according to whether the stripe isan a. m. or p. m. stripe while the places located in the samesubdivisions but on the opposite side of the time flange i and on thesame side of the clock are the places which have time which is l2 hoursdistant from the places indicated on the first side, namely if it is 2oclock p. m. in Tomsk, then it will be at the same instant 2 a. m. inChicago. It will be obvious that by this arrangement I can have thevarious stations in print so large it can be read without anydifficulty. If it is desired to have a greater numher of stations,letters may be printed as shown in the divisions indicating the smallercities and a book can be prepared giving the smaller stations for thesesubdivisions. In some cases it may be found desirable to have the casemounted. as shown in Fig. 7 and when this is done the numerals may, ifdesired, be 1 to 24 or they can be as shown in the other figures. Itwill be apparent this may be done without departing from the spirit ofmy invention. In this form the case 2" is laid on its side resting on abase 4'. A slot 3' is cut in the case. It may be covered with celluloid5. A disc similar to the disc 6 is provided having a circumferentialflange l on which may be printed the numerals. A stripe 8 divides the a.m. from the p. In. time.

For those locations which have daylight saving time I provide a thirdhand [3 which can be set for standard time; thus the clock will show thetime 55 for the locality where the clock is used yet the hand l3 willgive the standard time for locating the various foreign cities.

Having described my invention what I regard as new and desire to secureby Letters Patent is:

l. A word clock comprising a movement, a cylindrical casing having acircumferential slot cut therethrough, a disc having a circumferentialflange thereon, two sets of numerals each from one to twelve arrangedaround said flange and visible through the slot, semi-circumferentiallines on the flange to indicate one set of numerals as a. m. and theother p. m., means actuated by the clock movement to rotate said disconce in twentyfour hours and a plurality of subdivisions on theperiphery of the case to indicate respective cities.

2. A world clock comprising a movement, a cylindrical casing having acircumferential slot cut therethrough, a transparent closure for saidslot, a rotatable disc having a circumferential flange thereon, two setsof numerals each from one to twelve arranged around said flange andvisible through said slot, semi-circumferential means to indicate oneset of numerals as a. m. and the other p. m., means actuated by theclock movement to rotate said disc once in twenty-four hours and aplurality of parallel subdivisions on the periphery of the casingadjacent the slot to indicate respective cities.

3. A world clock comprising a movement, a cylindrical casing having acircumferential slot cut therethrough, a rotatable disc having acircumferential flange thereon visible through the slot, two sets oftime numerals each from one to twelve arranged around said flangebeneath the slot, means actuated by the clock movement to rotate saiddisc once in twenty-four hours, a plurality of parallel subdivisions onthe periphery of the case to indicate respective cities, the saidsubdivisions arranged adjacent the slot and cooperating With thenumerals for determining comparative times in difierent localities andoffset semi-circumferential lines on the flange to distinguish betweena. m. and p. m.

4. A World clock comprising a movement, a cylindrical casing having aslot cut therethrough, a transparent closure for said slot, a rotatabledisc having a circumferential flange thereon rotatable below the slotand visible therethrough, two sets of numerals each from one to twelvearranged around said flange and in line with the slot, offset parallelsemi-circumferential lines on the flange adjacent the numerals toindicate one set as a. m; and the other p. m., means actuated by theclock movement to rotate said disc once in twenty-four hours, aplurality of parallel circumferentially arrangedsubdivisions on theperiphery of the case and upon opposite sides of the slot to indicaterespective localities and a plurality of characters in each subdivision.

5. A world clock including a movement, a cylindrical casing having aplurality of pairs of time zones determined by longitude and displayedin a semicircle in opposed positions, each of said zones containing ageographical name of a city, two semi-circular stripes interposedbetween said zones and lying in difierent planes, the zones on one sideof each stripe indicating a. m., and the other p. m., and means actuatedby said clock movement to rotate said stripes.

6. A world clock including a movement, a cylindrical casing having aplurality of pairs of time zones determined by longitude and displayedin a semi-circle in opposed positions, each of said zones containing ageographical name of a city, two semi-circular stripes interposedbetween said zones and lying in different planes, the zones on one sideof each stripe indicating a. m. and the other p. m., a set of numeralsarranged adjacent each of said stripes and located adjacent each pair ofzones, and means actuated by said clock movement to move said numeralsand said stripes in units of time measurement.

HERMAN SCHLACHT.

